From http://www.w3schools.com (Copyright Refsnes Data)

XML Schema import Element

Complete XML Schema Reference

Definition and Usage

The import element is used to add multiple schemas with different target namespace to a document.

Element Information

Parent elements: schema

Syntax

<import
id=ID
namespace=anyURI
schemaLocation=anyURI
any attributes
>

(annotation?)

</import>

(The ? sign declares that the element can occur zero or one time inside the import element)

Attribute	Description
id	Optional. Specifies a unique ID for the element
namespace	Required. Specifies the URI of the namespace to import
schemaLocation	Optional. Specifies the URI to the schema for the imported namespace
any attributes	Optional. Specifies any other attributes with non-schema namespace

Example 1

The following example shows importing a namespace:

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

<xs:import namespace="http://www.w3schools.com/schema"/>

..

..

..

</xs:schema>

Complete XML Schema Reference